package com.example.mybatis;

import java.util.concurrent.CountDownLatch;

import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

@SpringBootTest
@RunWith(SpringJUnit4ClassRunner.class)
public class Test {
//并发数量
private static final int THREAD_NUM = 10000;
private CountDownLatch cdl = new CountDownLatch(THREAD_NUM);

    @org.junit.Test
    public void fun() {
    	for (int i = 0; i < THREAD_NUM; i++) {
    		Thread t = new Thread(() -> {
    			try {
    				// 减一
    				cdl.countDown();
    				// 等待
    				cdl.await();
    			} catch (InterruptedException e) {
    				e.printStackTrace();
    			}
    			// 并发执行(这里写业务。)
    			 System.out.println("并发执行。");
    		});
    		t.start();
    	}
    	try {
    		// 子线程创建完以后主线程退出，并没有等待子线程作业，所以先等待子线程作业。
    		Thread.sleep(1000);
    	} catch (InterruptedException e) {
    		e.printStackTrace();
    	}
    }

}